I hope you've been finding your way around mastodon in particular and the fediverse in general. It can be difficult at first to find things you're interested in. Writing an #introductions post helps people find you. Otherwise hashtags in general are a really good way to find the things you're interested in. #ff follow friday is one where every friday people recommend each other people to follow..
Otherwise here are some more resources to get you started: https://post.lurk.org/@rra/99949022743155550
Also as a lurker you can generate invite codes for your friends: